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THE WEEKLY BRIEFWeek ending September 25, 2026

AI keeps the rally alive as yields and oil press higher

Stocks finished the week higher as AI enthusiasm outweighed a 10-year Treasury yield near its highest since 2007 and Brent crude above $100. The rally is narrow, though: nine of the 11 S&P 500 sectors are down for September.

S&P 500 this week7,743.41+1.2% for the week · Friday +0.51%
Last Friday 7,650.50MonTueWedThuFri

Daily closes, Sept. 21–25, 2026. Source: Yahoo Finance and AP.

Reporting cutoff: U.S. market close, Friday, September 25, 2026. This is a dated snapshot, not a live market update.

S&P 500 Friday+0.51%Close: 7,743.41 · Week: +1.2%
10-year Treasury5.15%Friday close · Touched 5.22%, near highest since 2007
October hike odds~67%Futures-implied chance of a 25bp hike on Oct. 28
Sector breadth9 of 11Sectors down in September · Equal-weight S&P down about 4%

Three forces shaping the week

  1. AI is still carrying the market

    Microsoft’s Copilot revamp, Akamai’s $11.6 billion Anthropic deal, Meta’s Muse rally and AMD’s brief $1 trillion milestone kept AI leadership intact.

  2. Yields and oil keep the pressure on

    The 10-year yield touched 5.22% and Brent held above $100, while futures priced about a two-in-three chance of another Fed hike in October.

  3. A narrow rally

    Nine of 11 sectors are negative in September and the equal-weight S&P 500 is down about 4%, so the indexes look healthier than the average stock.

Past Market Briefs → · Revisit previous weekly editions.

Beyond Tech · Weekly column · September 25, 2026

Microsoft Wants Copilot to Become the Operating System for Work

This week’s signal isn’t another smarter chatbot. Microsoft’s new Copilot is built to do the work while people review the result, and that could change which skills, software and security matter most.

“The bigger technological shift wasn’t AI learning to answer our questions. It was AI learning to take responsibility for the next step.”
From this week’s column

Finance, Simplified · This week’s lesson · September 25, 2026

What Is Compound Interest?

Your money earns money, and then that new money can earn money too. One simple example, in about two minutes.

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